Chuck for press-plungers



No. 619,557. Patented Feb. !4, I899.

C. GABRIEL.

CHUCK FOR PRESS PLUNGERS.

UNITED STATES PATENT OFFICE.

CHARLES GABRIEL, OF CHICAGO, ILLINOIS.

CHUCK FOR PRESS-PLUNGERS.

SPECIFICATION forming part of Letters Patent No. 619,557, dated February 14, 1899.

Application filed. March 28, 1898- To all whom it may concern.-

Be it known that I, CHARLES GABRIEL, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Chucks for Press-Plungers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to a novel construction in a chuck for press or punch plungers and a punch therefor, the object being to provide a device of this character by means of which the male member of a punch or die can be more simply constructed than heretofore and firmly secured to the plunger and be made easily removable; and it consists in the features of construction and combinations of parts hereinafter fully described and claimed.

In the accompanying drawings, illustrating my invention, Figure 1 is a side elevation of a chuck constructed in accordance with my invention, showing it secured to the plunger and holdinga male member of a punch. Fig. 2 is a central longitudinal section on the line 2 2 of Fig. 1. Fig. 3 is a transverse section on the line 3 3 of Fig. 1. Fig. 4 shows two detail views in elevation, one being partially in section, of the one member of the chuck.

Referring now to said drawings, A indicates a portion of a punch-plunger, in the lower end of which the chuck B is rigidly mounted in any suitable manner. Said chuck B comprises the spindle 0, provided with a circumferential flange D, adapted to engage Serial No- 6'75,4=08. (No model.)

pered portion of said nut E a split ring I is mounted, which consists of two practically semicircular sections having spaces J between their adjacent ends and provided midway between their ends with longitudinal grooves K in their outer faces. The inner faces of said sections of said ring I are cylindrical,

said ring I are slightly rounded off along their upper edges to prevent them from burring or spreading.

The male member L of the punch is inserted in the said ring and abuts against the lower end of spindle O. The nut E is then screwed up upon said spindle 0, thus first forcing the upper end of the ring I against the lower end of said spindle and then contracting it around the shank of said member L of the punch and firmly clamping same and simultaneously centering it. Said sections of said ring I are adapted to give along the grooves K, where they are obviously weakest.

I-leretofore when it was desired to replace a punch it has always been necessary to remove the entire nut, insert anew punch, and replace the nut on the spindle, thus consuming a great deal of time and necessitating the use of a form of punch which is expensive, owing to the amount of turning in a lathe.

My construction enables the use of a punch, as shown, which consists of a piece of shafting the size of the shank K, which is turned 01f to the desired size. of the hole to be puncheda simple and cheap operation. One man can turn out about one hundred of said punches per diem against ten or twelve of the kind heretofore used.

I claim as my invention- A chuck for press-plungers comprising a spindle adapted to be secured to the plunger and screw-threaded at its lower end, a nut having an opening screw-threaded at its upper end adapted to fit said screw-threaded waybetween theirendsand parallel withtheir portion of said spindle and tapered below said inner faces, substantially as described. [0 screw-threaded portion, a split ring in said In testimony whereof I aifix my signature nut comprising two practically semicircular in presence of two witnesses.

sections tapered on their outer faces to cor- CHARLES GABRIEL. respond with the taper of said opening in WVitnesses:

said nut and having cylindrical inner faces, RUDOLPH WM. LOTZ,

and longitudinal grooves in said sections lnid- TM. SNOWHOOK. 

